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Font tools 4

Convert, subset, inspect and preview font files in your browser using opentype.js. Subsetting cuts a font down to the characters you use, which is the usual way to make a web font smaller. Each tool says what it keeps and what it drops.

1→1Convert a font to OTFRe-encode a TTF, OTF or WOFF font as OpenType/CFF (.otf). This build of opentype.js only writes CFF outlines (verified by execution: it always emits the OTTO sfnt tag, never TrueType glyf, regardless of the source format), so OTF is the one honest direction: a real outline-format change coming from a TrueType source, a clean re-serialize coming from an OTF one.Takes one file1→1Inspect a font fileRead a TTF/OTF/WOFF font's name table, glyph list or metrics table: one parse, three views.Takes one file1→1Render a font specimen sheetDraw a sample of a font's own glyphs to a PNG. It flattens the real bézier outlines and fills them with a nonzero-winding scanline rasterizer (no <canvas>, no upload), so what you see is what the font file contains.Takes one file1→1Subset a font to specific charactersDrop every glyph except the characters you list. A smaller file that still renders exactly the text you use.Takes one file

Questions

What can I do with a font here?

Convert between formats, subset it to a set of characters, inspect its tables and metadata, and preview it. All four run through opentype.js in the page, so a licensed font is never uploaded.

What does subsetting drop?

Everything outside the glyphs you keep. The output is built from a glyph list, so kerning pairs and ligatures do not survive, and the file is written as CFF .otf. The tool page states both, because a subset font that silently loses kerning looks like a rendering bug later.

Can I convert a font I licensed?

Technically yes, and whether you are allowed to is a question for your licence, not for this tool. Many licences restrict modification and conversion. Nothing here transmits the font anywhere.

Why is the output always .otf?

Because this build of opentype.js writes CFF outlines only. A TrueType glyf table is not produced. The pages say so rather than letting you find out in a browser that renders nothing.